CASTIdExpression.java

/*******************************************************************************
 * Copyright (c) 2005, 2012 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     John Camelon (IBM Rational Software) - Initial API and implementation
 *     Yuan Zhang / Beth Tibbitts (IBM Research)
 *     Bryan Wilkinson (QNX)
 *     Anton Leherbauer (Wind River Systems)
 *******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.c;

import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTCompletionContext;
import org.eclipse.cdt.core.dom.ast.IASTIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.ICompositeType;
import org.eclipse.cdt.core.dom.ast.IEnumeration;
import org.eclipse.cdt.core.dom.ast.IEnumerator;
import org.eclipse.cdt.core.dom.ast.IFunction;
import org.eclipse.cdt.core.dom.ast.IProblemBinding;
import org.eclipse.cdt.core.dom.ast.ISemanticProblem;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.IVariable;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.ProblemType;

/**
 * ID Expression in C.
 */
public class CASTIdExpression extends ASTNode implements IASTIdExpression, IASTCompletionContext {
    private IASTName name;

    public CASTIdExpression() {
	}

	public CASTIdExpression(IASTName name) {
		setName(name);
	}

	@Override
	public CASTIdExpression copy() {
		return copy(CopyStyle.withoutLocations);
	}

	@Override
	public CASTIdExpression copy(CopyStyle style) {
		CASTIdExpression copy = new CASTIdExpression(name == null ? null : name.copy(style));
		return copy(copy, style);
	}

	@Override
	public IASTName getName() {
        return name;
    }

    @Override
	public void setName(IASTName name) {
        assertNotFrozen();
        this.name = name;
        if (name != null) {
			name.setParent(this);
			name.setPropertyInParent(ID_NAME);
		}
    }

    @Override
	public boolean accept(ASTVisitor action) {
        if (action.shouldVisitExpressions) {
		    switch (action.visit(this)) {
	            case ASTVisitor.PROCESS_ABORT: return false;
	            case ASTVisitor.PROCESS_SKIP: return true;
	            default: break;
	        }
		}

        if (name != null && !name.accept(action)) return false;

        if (action.shouldVisitExpressions) {
		    switch (action.leave(this)) {
	            case ASTVisitor.PROCESS_ABORT: return false;
	            case ASTVisitor.PROCESS_SKIP: return true;
	            default: break;
	        }
		}
        return true;
    }

	@Override
	public int getRoleForName(IASTName n) {
		if (n == name) return r_reference;
		return r_unclear;
	}

	@Override
	public IType getExpressionType() {
		IBinding binding = getName().resolveBinding();
		if (binding instanceof IVariable) {
			return ((IVariable) binding).getType();
		}
		if (binding instanceof IFunction) {
			return ((IFunction) binding).getType();
		}
		if (binding instanceof IEnumerator) {
			return ((IEnumerator) binding).getType();
		}
		if (binding instanceof IProblemBinding) {
			return new ProblemType(ISemanticProblem.TYPE_UNRESOLVED_NAME);
		}
		return new ProblemType(ISemanticProblem.TYPE_UNKNOWN_FOR_EXPRESSION);
	}

	@Override
	public boolean isLValue() {
		return true;
	}

	@Override
	public final ValueCategory getValueCategory() {
		return ValueCategory.LVALUE;
	}

	@Override
	public IBinding[] findBindings(IASTName n, boolean isPrefix) {
		IBinding[] bindings = CVisitor.findBindingsForContentAssist(n, isPrefix);

		for (int i = 0; i < bindings.length; i++) {
			if (bindings[i] instanceof IEnumeration || bindings[i] instanceof ICompositeType) {
				bindings[i]= null;
			}
		}

		return ArrayUtil.removeNulls(IBinding.class, bindings);
	}
}